Sketching apparatus.



W. T. S. OBRIEN.

SKETGHING APPARATUS.

APPLICATION FILED AUG. 24, 1911.

Patented 81211112211914.

3 SHEET8SHEET 1.

.W. T. S. OBRIEN.

SKETOHING APPARATUS.

APPLICATION FILED 11116.24, 1911.

Patented Sept. 22, 1914.

3 SHEETS-SHEET 2.

W. T. S. O'BRIEN.

SKETUHING APPARATUS.

APPLICATION FILED AUG. 24, 1911.

Patented Sept. 22, 1914..

3 SHEETS-SHEET 3.

STATES PATENT OFFICE,

WALTER THOMAS SMITH OBRIEN, or NORTH SYDNEY, NEW soUTH WALES,

- -"-AUsTB.ALIA. W

SKETGHING APPARATUS.

Specification. of Letters Patent. Patehted S t 22, 1914 Application filed August 24, 1911. Serial No. 645,709.

To all whom it may concern Be it known that I, WALTER THOMAS SMITH OBRIEN, asubject of theKing of Great Britain and Ireland, and resident of 37 Ernest street, North Sydney, in the State of New South Vales, Commonwealth of Australia, have invented certain new and useful Improvements .in Sketching Apparatus, of which the following is a specification.

This apparatus has for its object the vis ually projecting of a picture, print, photograph, map, objector such like on to a blank sheet or other surface suitable for drawing upon for the purpose of aiding the reproduction thereof by free hand drawing, or by painting in colors. It also facilitates the reproduction by free hand drawing of studies from life and still life.

I have discovered that when an object is viewed through a lens of certain form by one eye of the observer, and screened from the direct visionof the other eye, the latter sees a visual projection of the object thrown upon any suitably positioned surface'and if the projection is sufliciently clear and distinct, as, for instance, upon a'blank sheet of paper orthe'like, the visionary picture may be traced by a pen or pencil held in the hand of the observer. As the visual projection also shows clearly the shading and colors these may be reproduced by suitablemeans, as for example line shading-'orbrushwork';

The "invention herein described consists therefore of an apparatus designed and adapted to carry the optical lens, a table or platform to receive and .support the object, a screen to separate the lines of vision .of the eyes, and-Ia support for the-surface upon which the visual projection is thrown, the wholebeing arranged in one complete apparatus provided with the necessary means for focusing the object and for advancing or retiring the reproducing sur-' face according to the .scale uponwhic'h it is desired that the reproduction should be drawn.

The apparatus may be constructed and arrangedin Itwo modifications, one of which is adaptable for the reproduction of an object which may be conveniently arranged upon the table or platform, while the other is for the reproduction .on a reduced scale of objects which by reason of their size, po-

sition or permanent location cannot conveniently be manipulated.

In order to give a practical illustration of the invention I will now refer to the accompanying sheets of drawings forming part of this specification and in which Figure 1 is 'al'perspectiveview of the apparatus constructed and arranged for the reproduction of an object placed upon the platform; Fig. 2 is a vertical section through the same; Fig. 3 is a perspective view of theapparatus modified to facilitate reproduction from life or large objects,'and Fig. 4 is a horizontal section thereof on line C. C. show ng the approximate position of the eyes when using the apparatus.

1 is the base upon which is erected the post 2 supporting the carrier frame 3 mounted .upon the boss 4. This boss is capable of vertical and rotary movement upon the post- 2, and a set screw 5 serves to secure it in position.

The frame 3 supports -the table 6 upon which the picture 7 or such like to .be reproduced is placed and held in the spring actuated clips 8. ,8. he carrier frame .3 also .supports a horizontally placed bar 9 upon: which is mounted a slider 10 capable of'transverse movement along the 'bar 9.. This slider is formed with a boss 11 I 13locks the rod 12 in position and another position by set screw 14 locksfthe slider 10 upon the bar 9.

'f :Upon the upper end of therod 12 is pivoted a horizontally placed arm 15 which upports at its outer end a frame 16,. In this frameis mounted a sector of a double convex lens17 and pendant from it is a'-- screen 18. The drawing sheet, block, or such like is shown at 19.

In the modification shown in Figs. 3 and 4 the frame 16 carrying a sector of'a double convex lens 17- is swung into a vertical po-- sition to enable the operator to work from a life study .or a large object which .could not convementlybe placed horizontally on a table. In the modification, the sheet of drawing paper or sketching block 19 is held by the vertical frame 20 which is supported.

from the rod 12 by an arm 21 secured .to the boss 22 and capable of verticaL movement upon the rod 12: A' setscrew 23 secures said =arm. in position. The object tobe drawn is shown at 24;.

Referring to Figs. 1 and2, the object to be reproduced is placed upon the table 6 and if necessary secured by the clips 8. 8. The lens '17 is focused upon the picture by' means of the vertical adjustment provided- I may be varied to suit requirements, thus if the carrier frame is advanced toward the 'sketching'block the visual projection will be on a smaller 'scale than if it is retired fromit. H 1

' In carrying out the invention the operator having placed his object 7 upon the table 6 and, if necessary, secured it in position by the spring clips 8, focuses the lens 17 upon it. He then adjusts the table to conform to the scale to which he wishes to draw the copy, adjusting the table upwardly to reproduce a picture on a large scale or downwardly to reproduce it on a small scale. To

enable him to do this he views the picture with one eye placed close to the lens 17 and with the other eye the visual projection 7 of the picture.on the'drawing paper 19. If he sketches with his right hand he views the picture with'his left eye A and with the right eye B-" thedrawing paper. If he ,wishes to sketch with his left hand he reverses the position of the apparatus so that hethen views the picture with his right eye B- and the drawing paper with his left eye A. The screen 18 effectually cuts off the operators view of the picture from that of the drawin paper.

The effect 0 observing the picture 7 with .one eye through the lens 17 and the blank drawing paper 19 with the other as described shows the viewer a visual projection of the picture on the blank paper which he may readily trace with pen or pencil. Should the picture be in colors these will be clearly shown in the visual projection and may be readily reproduced in the copy.

- If the picture to be copied is so large that it occupies a space larger than that provided by the surface of the table the picture is folded down over the edges of the'table 6 by the clips 8, the portion to be copied resting upon the horizontal surface of the table 6. Upon that portion being completed it is drawn forward and a fresh piece exposed to view. In the same way if the picture cannot be viewed for its entire height without distortion, the slider 10 carrying the lens 17 is moved along the horizontal bar 9 to enable it to be viewed correctly, the. slider being locked'in position by the set screw 13 when the draftsman is at work.

Referring to Figs. 3 and 4 in the modification the apparatus is adapted to enable the copying of large objects, which cannot conveniently be done by the use of the apparatus shown in Figs. 1 and 2, to be accomplished, such for instance as studies from life or still life. In this case the frame carrying the lens 17 which is identical with that shown in Figs. 1 and 2 is swung around until it assumes a vertical position. A horizontal arm 21 supports a vertically placed frame 20 which in turn supports the drawing surface.-

The operator views the. object, to be drawn, marked 24 with one. e e .-B'-- and with the otheneye A presse close to the lens 17 viewsa visual projection of'that object on the drawing paper 19. As in the apparatus shown in Figs. 1 and 2 the scale to which the operator wishes to reproducethe object is regulated by advancing or retiring the apparatus to or from the reproduction surface.

If a distorted view of the subject to be copied is required, this may be obtained b canting or inclining the lens 17 as require when a broadening or lengthening effect can be produced.

Although mention has been made in the specification that a sector of a double convex lens is employed, I would have it understood that an entire lens may also be used. In the latter case, however, the draftsman obtains a better sight by viewing the picture through any-portion of the lens other than the center, as the angular view thus obtained has the effect of throwing the gphually projected image farther away from e normal sight line so that a larger field is covered by the eye which views the visual projection.

What I claim and desire to secure by Letters Patent is 1. A reproducing apparatus, comprising a single lens, means for supporting said lens, and a screen carried by said lens-supporting means for allowing one eye of the operator toview only the objectto be reproduced and .the other eye to view only the surface on [which the reproduction is to be made.

I or ho ding said lens and o ject-su porting means in ad usted pos tion relative to the surface on whlch the reproduction o the obat ases ject is to be made, and a screen carried by said lens-supporting means for separating the lines of vision of the eyes of the operator.

4. Apparatus for the urpose specified, comprising a lens, rotata ly-mounted supporting. means for said lens, and a screen carried by said-lens-supporting means for separating the lines of vision of the eyes of the 0 erator.

5. pparatus for the purpose specified, comprising a lens, means for supporting said lens, a rod on which said supporting means is rotatably adjustable, a member in which said rod is adjustably secured, and a screen carried by said lens-supporting means for separating the lines of vision of the eyes of the operator.

6. Apparatus for the purpose specified, comprising a lens, means for supporting said lens, a rod on which said supporting means is rotatably adjustable, a member in which said rod is adjustably secured, said member being itself adjustable in a direction at right angles to the direction of adjustment of the rod, and a screen carried by said lens-supporting means for separating' the lines of vision oi eyes of the operator.

7. Apparatus for the purpose specified, comprising a lens, means for supporting said lens, means for supporting the object to be reproduced, the lens-supporting means being carried by the object-supporting means, a, pillar upon which the latter is slidably secured, and "a screen carried by said lens-supporting means for separating the lines or vision of the eyes of the operator.

8. Apparatus for the purpose specified, comprising a lens, means for carrying said lens, a rod on which said carrying means is rotatably adjustable, a member in which said rod is adjustably secured, means for supporting the object to be reproduced, upon which means said member is slidably secured, a pillar upon which the object supporting means is slidably secured,. and a screen carried by said lens carrying means for separating the lines of vision 0: 5 the eyes of the operator,

9. Apparatus for tne'purpose specified, comprising a lens, means for supporting said lens, means for supporting the picture to be reproduced, spring clamping means for retaining said picture on said supporting means, and a screen carried by said lens-supporting means for separating th lines of vision oi the eyes of the operator,

Signed at Sydney, New South Wales, this 12th day of July, A. D.

WALTER THQHAS SllHTH WBRIEH,

itnesses WM. Nnw'rorr, Cass. Eamon, 

